I just book a ticket for 2 from Spiez to Venice but did not receive E-ticket yet c.hamthanon@gmail.com please help

Just made a booking with italiarail.com traveling from spiez to venice for 2 person. I will be traveling on the 9th April 2016. The payment was succesful but however E ticket is not deliver to my email. Please let me know what i need to do?